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Whoever the first person to think that is a little off. Homes all over the place have poly mainlines. Now you don't want to have poly at all for a sprinkler system with pipes ranging from 2" up.......PVC is the main choice for bigger commercial systems.

Poly upstream of valves

I have been told you can not use poly upstream of the control valves because of bursting secondary surging. I need to(or at least would like to) locate my valves some distance from the breaker and I live in a freezing climate. Is this true of poly?